Subject: Supply Chain Management

Answer the following questions base on the actual sales data, listed below. Keep 2 decimal point for all calculation step. Show sufficient calculation step for partial credit.\

Month	Sales data
Apr	500
May	480
June	420
July	550
Aug	520
Sept	450
Oct	490
Nov	560

(a) Determine the forecast error using MAPE if, the forecasting method is Weighted Moving Average (N=3) where weights are 9, 2,10. (8 marks)

(b) Determine the forecast error using MAD if, the forecasting method is Linear Regression, where slope = -5 and intercept = 510 (5 marks)

(c) Explain why your solution from part (a) and part (b) cannot be utilized to determine which forecasting model is deem more accurate. Discuss the necessary modification to enable accuracy comparison between forecasting model in part (a) and in part (b) (7 marks)

(d) Based on your conclusion in part (c), determine which forecasting model, part (a) or part (b), is deem more accurate. Justify your conclusion. (5 marks)